feat: add react-webpack example

react-webpack/.babelrc

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+{
+  "presets": ["@babel/preset-react"]
+}

react-webpack/.gitignore

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+node_modules/
+.DS_Store
+.env
+src/.DS_Store

react-webpack/README.md

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+# React + Webpack + (typescript)
+
+This is a sample project that shows off the functionalities of the Swarm network, and serves as a simple example for developers looking to build a dApp that uses the decentralised Swarm storage with a vanilla ReactJs and Webpack setup.
+
+## Dev Stacks
+
+1. Node.js 16 or higher (LTS)
+2. Webpack as the bundler
+3. Modern React (functional components)
+4. Latest @ethersphere/bee-js version
+
+### Functionality
+
+1. List available postage batches
+2. Create new postage batch
+3. Upload file(s)
+4. Access to uploaded file
+
+### Usage
+
+To use the app, you should have a Bee node running either locally or remotely for which you're going to need the exposed url/port to connect to via the home page of the app.
+
+Install dependencies, start the app and generate a static version of app
+
+1. `npm install`
+2. `npm start`
+3. `npm run build`